[mooreds]

What are the benefits? The costs are pretty clear (time spent moderating), but I'm not sure what the benefits of the feature would be.

That is probably worth spending time thinking about.

[hyperknot]

I guess the benefit would be possibly higher SEO / DR, as you'd have a lot of backlinks scattered around the interwebs. But then it can be misused and then all your domain can also be trashed.

I believe this is probably beneficial for bigger companies / VC funded projects where they have the resources for moderation.